| cranial vertebra | A segment of the skull regarded as homologous with a segment of the vertebral column. (05 Mar 2000) |
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| ivory vertebra | A radiographically dense vertebra, usually from metastatic disease, especially lymphoma when solitary. (05 Mar 2000) |
| odontoid vertebra | <botany> A stem, commonly used for the main stem of a whole plant or of an inflorescence. (09 Oct 1997) |
| toothed vertebra | <botany> A stem, commonly used for the main stem of a whole plant or of an inflorescence. (09 Oct 1997) |
| true vertebra | Any one of the cervical, thoracic, or lumbar vertebrae. Synonym: vertebra vera. (05 Mar 2000) |
| anterior descending artery | <anatomy, artery> Anterior interventricular branch of left coronary artery. Terminal branch (with circumflex coronary artery) of left coronary artery; descends in anterior interventricular groove to apex, anastomosing with posterior interventricular artery. Supplies most of sternal aspect of ventricles and anterior two-thirds of interventricular septum, including atrioventricular bundle of conducting tissue. Synonym: ramus interventricularis anterior arteriae coronariae sinistrae, anterior descending artery. (05 Mar 2000) |
| groove for the descending aorta | A broad, deep, vertical sulcus immediately posterior to the hilus on the mediastinal surface of the left lung, formed as a result of the descending aorta impressing or indenting the lung. (05 Mar 2000) |
| pharyngeal branch of descending palatine artery | <anatomy, artery> May arise as a separate branch or as a continuation of lesser palatine artery. Synonym: ramus pharyngeus arteriae palatini descendens. (05 Mar 2000) |
| posterior descending artery | <anatomy, artery> Posterior interventricular branch of right coronary artery. Continuation of right coronary artery in posterior interventricular sulcus; descends to apex to anastomose with anterior interventricular artery; supplies most of diaphragmatic aspect of ventricles and posterior third of interventricular septum. Synonym: ramus interventricularis posterior arteriae coronariae dextrae, posterior descending artery. (05 Mar 2000) |
| saphenous branch of descending genicular artery | <anatomy, artery> Branch of descending genicular artery supplying skin of the upper part of the medial aspect of the leg; anastomosis: medial inferior genicular artery (articular vascular network of knee). Synonym: ramus saphenus arteriae descendentis genicularis. (05 Mar 2000) |
| descending | Of or pertaining to descent; moving downwards. <astronomy> Descending constellations or signs, that point in a planet's orbit where it intersects the ecliptic in passing southward. <mathematics> Descending series, a series in which each term is numerically smaller than the preceding one; also, a series arranged according to descending powers of a quantity. Source: Websters Dictionary (01 Mar 1998) |
| descending anterior branch | The descending anterior branch of the superior lobar branches of the right and left pulmonry arteries. Synonym: ramus anterior descendens. (05 Mar 2000) |
| descending aorta | A part of the aorta, further divided into the thoracic aorta and the abdominal aorta. Synonym: pars descendens aortae, aorta descendens, descending part of aorta. (05 Mar 2000) |
| descending artery of knee | <anatomy, artery> Origin, femoral, in adductor canal; distribution, penetrates vastoadductor fascia to supply knee joint and adjacent parts; anastomoses, medial superior genicular, medial inferior genicular, lateral superior genicular, lateral inferior genicular and anterior tibial recurrent arteries, i.e., articular network of knee. Synonym: arteria genus descendens, arteria anastomotica magna, descending artery of knee, great anastomotic artery. (05 Mar 2000) |
| descending branch | Branch of an artery or nerve passing inferiorly. Descending branches have been described for the following: descending branch of hypoglossal nerve, superior root of ansa cervicalis; descending branch of lateral circumflex femoral artery; descending branch of the occipital artery. Synonym: ramus descendens. (05 Mar 2000) |